Youtube is one of those websites which people of all age groups use with ease. it is useful not only to younger generation but also to the kids and seniors.
Starting from how to use the needle to how to prepare nuclear bombs is been explain in detail using youtube videos so it has both pros and cons of its own.
It depends on the youtube users in what way they use the videos. I always have very good experience of this website to learn anything which makes my life easy and comfortable.